package com.alex.renju.renju.service;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author: Alex
 * @Description:
 * @Date: 2021/9/25
 */
@ServerEndpoint("/renjuserver/{userId}")
@Component
public class WebSocketServer {

    /**
     * 在线人数
     */
    private static Set<String> userIdList = new HashSet<>();

    /**
     * 对弈人数
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;
    /**
     * 接收userId
     */
    private String userId = "";


    /**
     * 连接游戏8
     */
    public static void addOnLineUser(String userId) {
        userIdList.add(userId);
    }

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
            //加入set中
        } else {
            webSocketMap.put(userId, this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }

        System.out.println("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());

        try {
            sendMessage("{\"toUser\":\"0\",\"status\":\"-1\",\"x\":\"0\",\"y\":\"0\"}");
        } catch (IOException e) {
            System.out.println("用户:" + userId + ",网络异常!!!!!!");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        System.out.println("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("用户消息:" + userId + ",报文:" + message);
        //可以群发消息
        //消息保存到数据库、redis
        try {
            //解析发送的报文
            JSONObject jsonObject = JSON.parseObject(message);
            //追加发送人(防止串改)
            jsonObject.put("fromUserId", this.userId);
            String toUserId = jsonObject.getString("toUser");
            //传送给对应toUserId用户的websocket
            if (toUserId != null && toUserId != "" && webSocketMap.containsKey(toUserId)) {
                webSocketMap.get(toUserId).sendMessage(message);
            } else {
                System.out.println("请求的userId:" + toUserId + "不在该服务器上");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    public static boolean userIsServer(String user) {
        if (user != null && user != "" && webSocketMap.containsKey(user)) {
            return true;
        }
        return false;
    }

    public static boolean userIdListIsServer(String user) {
        if (user != null && user != "" && userIdList.contains(user)) {
            return true;
        }
        return false;
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     */
    public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
        System.out.println(message + "-" + userId);
        System.out.println("发送消息到:" + userId + "，报文:" + message);
        if (userId != null && userId != "" && webSocketMap.containsKey(userId)) {
            webSocketMap.get(userId).sendMessage(message);
        } else {
            System.out.println("用户" + userId + ",不在线！");
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
